CN112910313B - Noise reduction and energy conversion device and method combining Helmholtz resonance effect and Venturi effect - Google Patents
Noise reduction and energy conversion device and method combining Helmholtz resonance effect and Venturi effect Download PDFInfo
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Abstract
The invention provides a noise reduction and transduction device and method combining a Helmholtz resonance effect and a Venturi effect, belonging to the technical field of noise control and novel energy power generation, wherein the noise reduction and transduction device comprises a sound energy power generation and noise reduction plate and a piezoelectric sheet, and a working unit consisting of a Helmholtz resonator and a Venturi channel is arranged in the sound energy power generation and noise reduction plate; the Helmholtz resonator is vertically arranged and comprises a Helmholtz resonant cavity and a neck which are communicated, and the top of the Helmholtz resonant cavity is sealed by a piezoelectric sheet arranged on an opening on the top surface of the acoustic energy power generation noise reduction plate; the Venturi channel transversely penetrates through the front face and the back face of the acoustic energy power generation noise reduction plate and comprises an inlet section, a throat and an outlet section which are communicated, and the throat is communicated with the neck of the Helmholtz resonator. Combine helmholtz resonance effect and venturi effect in a device, can collect noise and air current in the environment simultaneously, improve energy conversion efficiency, when making an uproar, change the noise waste into valuables, utilize the noise electricity generation.
Description
Technical Field
The invention belongs to the technical field of noise control and novel energy power generation, and particularly discloses a noise reduction and transduction device and method combining a Helmholtz resonance effect and a Venturi effect.
Background
The human beings have the history of thousands of years of using the energy on the earth to provide convenience for the human beings, and the use of wind energy, heat energy and light energy greatly facilitates the life development of the human beings. However, in the 21 st century, with the development of human science and technology and the increasing population of the world, the demand of human beings for energy is increasing, and the use of non-renewable energy sources is not a long time. Although human beings have conducted extensive research on renewable energy collection technology, there still exist energy sources around us that are ignored and wasted, and acoustic energy is one of them, and the generation of acoustic energy is visible everywhere but rarely utilized. And at present people regard noise as a hazard to suppress, and the processing of noise focuses only on the suppression of noise, ignoring the possibility that noise can be utilized by humans as a ubiquitous source of energy. Although the method can effectively isolate or reduce noise, the noise energy is converted into heat energy, and the waste of resources is caused.
With the rapid development of microelectronic devices and wireless sensor network technologies, the scale of their use increases in geometric progression, but the problem of energy supply for these devices has always limited their application, most of the energy supply for small portable electronic devices and wireless sensors has been mainly battery powered at present, although the production process of battery technology is mature and the use is convenient and simple, the life of the battery is short for these electronic devices, and the cost of replacing the battery is expensive in some occasions, even difficult to implement, and the large amount of discarded batteries can cause long-term pollution to the surrounding environment, and the defect of the battery hinders the development of small portable electronic devices and wireless sensors, so it is of great importance to research new energy supply technologies.
Chinese patent CN201911395052.2, which discloses a double-cavity coupling type noise generator and a power generation method, wherein the generator comprises a helmholtz resonant cavity, a piezoelectric unit, an extension neck and an ac/dc conversion circuit; the piezoelectric unit sets up on the inner chamber lateral wall of Helmholtz resonant cavity, and Helmholtz resonant cavity includes 2 at least closed resonance cavities that parallel, and the trompil aperture that utilizes the two-chamber roof is different, and the sound pressure phase place can reach completely opposite in two adjacent Helmholtz resonant cavities to be in between two chambeies on the lateral wall with the piezoceramics piece that the electrode slice links to each other receive the effect of push-pull force, realized the voltage output of sound wave generator. But its sound collection module only utilizes the neck of helmholtz resonator, and its neck diameter of advancing is 1.2mm, 1.9mm respectively, and collection efficiency is lower, and its piezoelectric patches is difficult fixed simultaneously, and the installation is difficult, difficult production.
Chinese patent CN200920316562.1 discloses a sound energy power generation device, which comprises an electricity storage unit and a base, wherein the base is provided with a single or multiple sound-electricity converters, the sound-electricity converters comprise a sound guide tube, the sound guide tube is internally divided into a front cavity and a rear cavity, and the front cavity receives external sound waves to generate resonance to push the sound-electricity converters of the rear cavity to generate induced current. The device utilizes the induction coil and the induction magnet to cut the magnetic induction line for generating power, the device is complex, the cost is high, and meanwhile, the efficiency of the sound energy collecting module is low.
Chinese patent CN201620788162.0, which discloses a sound energy power generation device, comprising a helmholtz resonator, a piezoelectric ceramic plate, a rectifier bridge, a non-polar capacitor and an electrolytic capacitor; the Helmholtz resonator collects the sound that the speaker sent, and the piezoceramics piece sets up on the Helmholtz resonator, through its transduction of Helmholtz resonator drive, the input of filtering energy storage module is connected to the piezoceramics piece output. According to the invention, the sound energy is collected only by using the Helmholtz resonator, the collection efficiency is lower, and meanwhile, the piezoelectric ceramic plate is fixed on the Helmholtz resonator in a gluing mode, so that the fixing mode is unstable, the piezoelectric ceramic plate is easy to fall off, and the piezoelectric ceramic plate is difficult to replace.
The existing acoustic energy generating device basically utilizes a single physical effect to convert energy, and does not integrate a plurality of physical effects on one device to convert energy and suppress noise. In addition, in the prior art, the piezoelectric sheets and the piezoelectric cantilever beams are mostly glued, and the fixing mode is greatly influenced by human factors, so that the performance difference between individuals is large.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a noise reduction and transduction device and method combining a Helmholtz (Helmholtz) resonance effect and a Venturi (Venturi) effect.
The invention provides a noise reduction and transduction device combining a Helmholtz resonance effect and a Venturi effect, which comprises a sound energy power generation noise reduction plate and a piezoelectric sheet, wherein a working unit consisting of a Helmholtz resonator and a Venturi channel is arranged in the sound energy power generation noise reduction plate; the Helmholtz resonator is vertically arranged and comprises a Helmholtz resonant cavity and a neck which are communicated, and the top of the Helmholtz resonant cavity is sealed by a piezoelectric sheet arranged on an opening on the top surface of the acoustic energy power generation noise reduction plate; the Venturi channel transversely penetrates through the front face and the back face of the acoustic energy power generation noise reduction plate and comprises an inlet section, a throat and an outlet section which are communicated, and the throat is communicated with the neck of the Helmholtz resonator.
Further, the helmholtz resonator is designed according to the following formula:
in the formula (I), the compound is shown in the specification,fat the frequency of the helmholtz resonance,cin order to be the speed of sound,sis the cross-sectional area of the neck part,lthe height of the neck part is taken as the height of the neck part,dis the diameter of the neck section, and v is the volume of the Helmholtz resonance cavity;
the venturi channel design follows the following principle:
the inlet section is a conical pipe, and the cone angle is 21 +/-2 degrees; the throat is a straight pipe; the outlet section is a conical pipe, and the cone angle is 8-15 degrees.
Furthermore, a plurality of working units are sequentially arranged in the acoustic energy power generation noise reduction plate, a wire groove is formed in the bottom surface of the acoustic energy power generation noise reduction plate, and a threading hole penetrating through the top surface and the bottom surface is formed in the wire groove; the piezoelectric pieces corresponding to each working unit are connected by a lead, and the lead passes through the wire groove and the threading hole to be connected with an external circuit.
Furthermore, the noise reduction and transduction device combining the Helmholtz resonance effect and the Venturi effect comprises a plurality of layers of acoustic energy power generation and noise reduction plates; the top surface of every layer of acoustic energy power generation noise reduction plate is provided with the connecting groove, and the bottom surface is provided with the connecting block, and connecting groove and connecting block all are located the side tip of acoustic energy power generation noise reduction plate and all are provided with bolt hole I, and the connecting block of the last acoustic energy power generation noise reduction plate inserts and passes through bolted connection in the connecting groove of the next acoustic energy power generation noise reduction plate.
Furthermore, the front and the back of each layer of the acoustic energy power generation noise reduction plate are provided with a positioning groove and a positioning plate, the positioning groove is formed downwards from the top surface of the acoustic energy power generation noise reduction plate, the positioning plate extends downwards from the bottom surface of the acoustic energy power generation noise reduction plate, and the positioning plate of the previous acoustic energy power generation noise reduction plate is inserted into the positioning groove of the next acoustic energy power generation noise reduction plate.
Furthermore, a positioning pin is arranged on the side surface of the positioning plate, and a pin groove corresponding to the positioning pin is arranged on the positioning groove.
Further, the positioning plate and the positioning groove are provided with bolt holes II, and the positioning plate and the positioning groove are connected through bolts.
Furthermore, an opening in the top surface of the acoustic energy power generation noise reduction plate is provided with a concave table, the piezoelectric sheet is placed in the concave table, the piezoelectric sheet is provided with a sealing ring, and the previous acoustic energy power generation noise reduction plate compresses the sealing ring of the next acoustic energy power generation noise reduction plate.
Furthermore, the noise reduction and transduction device combining the Helmholtz resonance effect and the Venturi effect further comprises a top cover arranged above the uppermost acoustic energy power generation noise reduction plate and a bottom plate arranged below the lowermost acoustic energy power generation noise reduction plate; the top cover is provided with a top cover connecting block corresponding to the connecting groove and a top cover positioning plate corresponding to the positioning groove, the top cover connecting block is inserted into the connecting groove of the uppermost acoustic energy power generation noise reduction plate and connected through a bolt, and the top cover positioning plate is inserted into the positioning groove of the uppermost acoustic energy power generation noise reduction plate and connected through a bolt; the bottom plate is a sound energy power generation noise reduction plate with a flat bottom surface.
The invention also provides a noise reduction and transduction method combining the Helmholtz resonance effect and the Venturi effect, wherein a piezoelectric sheet in the noise reduction and transduction device combining the Helmholtz resonance effect and the Venturi effect is connected with an external circuit;
according to the Helmholtz resonance effect, when incident noise is consistent with the natural frequency of a Helmholtz resonator, sound waves press gas in a Helmholtz resonance cavity to generate compression expansion reciprocating deformation through a neck, so that a piezoelectric sheet is stretched, compressed and reciprocated, and alternating charges are generated on the surface of the piezoelectric sheet due to the piezoelectric effect, the piezoelectric sheet is connected in series and in parallel, and after current signals are rectified and converted, direct current is formed, the conversion from sound energy of the noise to electric energy is realized, and meanwhile, noise suppression is realized;
according to the Venturi effect, when the limited flow passes through a reduced flow cross section, the flow velocity of fluid is increased, and the Bernoulli's law shows that the increase of the flow velocity is accompanied with the reduction of the fluid pressure, airflow enters a throat from an inlet section of a Venturi channel, high-speed flow can be generated, low pressure can be generated near the fluid flowing at high speed, so that adsorption effect is generated, a piezoelectric sheet is deformed due to the fact that the throat is connected with a Helmholtz resonator, the pressure of the Helmholtz resonator is lower than the environmental pressure, electric charges can be generated on the surface of the piezoelectric sheet due to the piezoelectric effect, the piezoelectric sheet is connected in series and in parallel, and direct current is formed after current signals are rectified and converted, so that the conversion of the kinetic energy of the fluid into electric energy is realized;
both effects work simultaneously when there is both noise and air flow in the environment.
Compared with the prior art, the invention has the beneficial effects that:
1. the noise is changed into valuable while being reduced, the noise is utilized to generate electricity, the problem of energy supply of small-sized electric equipment in the environments of markets, streets, roads and the like is solved, the generation amount of scrapped batteries is reduced, and the pollution to the environment is reduced;
2. the Helmholtz resonance effect and the Venturi effect are combined in one device, so that noise and airflow in the environment can be collected simultaneously, and the energy conversion efficiency is improved;
3. the noise reduction and energy conversion device is arranged into a combined structure between layers, and has enough working space for installing the piezoelectric sheets and the circuits, so that the installation of the piezoelectric sheets and the connection of the circuits are more convenient and time-saving, and the installation between each layer is very simple;
4. the piezoelectric piece is fixed with the sealing ring through the concave platform structure, the fixing mode is more convenient and reliable, the piezoelectric piece is convenient to disassemble and assemble, and the disassembling and assembling cannot be damaged.
Drawings
FIG. 1 is a front view of an acoustic power generating noise reduction panel;
FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;
FIG. 3 is a bottom view of an acoustic power generating noise reduction panel;
FIG. 4 is an overall assembly view of the noise reducing transducer assembly;
FIG. 5 is an assembly diagram of two adjacent groups of acoustic energy power generation and noise reduction plates;
fig. 6 is a simulated two-dimensional graph of the transmission loss of the helmholtz resonator of the working unit in example 3.
In the figure: 1-acoustic energy power generation noise reduction plate; 2-a piezoelectric sheet; a 3-Helmholtz resonator; 3.1-helmholtz resonator; 3.2-neck; 4-a venturi channel; 4.1-inlet section; 4.2-laryngeal orifice; 4.3-outlet section; 5-a wire groove; 6-threading hole; 7-connecting grooves; 8-connecting blocks; 9-bolt hole I; 10-positioning grooves; 11-a positioning plate; 12-a locating pin; 13-bolt hole II; 14-a sealing ring; 15-a top cover; 16-bottom plate.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "vertical", "horizontal", "top", "bottom", "front", "back", etc. indicate orientations or positional relationships only for the purpose of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or part must have a specific orientation, and therefore, should not be construed as limiting the present invention.
Example 1
The embodiment provides a noise reduction and transduction device combining a helmholtz resonance effect and a venturi effect, which comprises a sound energy power generation noise reduction plate 1 and a piezoelectric sheet 2, wherein a working unit consisting of a helmholtz resonator 3 and a venturi channel 4 is arranged in the sound energy power generation noise reduction plate 1; the Helmholtz resonator 3 is vertically arranged and comprises a Helmholtz resonant cavity 3.1 and a neck 3.2 which are communicated, and the top of the Helmholtz resonant cavity 3.1 is sealed by a piezoelectric sheet 2 arranged on an opening on the top surface of the acoustic energy power generation noise reduction plate 1; the venturi channel 4 transversely penetrates through the front and back of the acoustic energy power generation noise reduction plate 1 and comprises an inlet section 4.1, a throat 4.2 and an outlet section 4.3 which are communicated, and the throat 4.2 is communicated with the neck 3.2 of the Helmholtz resonator 3.
Further, the helmholtz resonator 3 is designed according to the following formula:
in the formula (I), the compound is shown in the specification,fat the frequency of the helmholtz resonance,cin order to be the speed of sound,sis the cross-sectional area of the neck part,lthe height of the neck part is taken as the height of the neck part,dis the diameter of the neck section, and v is the volume of the Helmholtz resonance cavity;
the venturi channel design follows the following principle:
the inlet section 4.1 is a conical tube with a cone angle of 21 degrees plus or minus 2 degrees; the throat 4.2 is a straight pipe; the outlet section 4.3 is a conical tube with a cone angle of 8-15 degrees.
Furthermore, a plurality of working units are sequentially arranged in the acoustic energy power generation noise reduction plate 1, a wire slot 5 is arranged on the bottom surface, and a threading hole 6 penetrating through the top surface and the bottom surface is arranged on the wire slot 5; the piezoelectric pieces 2 corresponding to each working unit are connected by a lead, and the lead passes through the wire slot 5 and the threading hole 6 to be connected with an external circuit.
The noise control effect and the energy conversion of a single working unit are limited, so that the structure is formed into a multilayer array structure. The noise reduction and transduction device combining the Helmholtz resonance effect and the Venturi effect comprises a plurality of layers of acoustic energy power generation noise reduction plates 1; the top surface of each layer of the acoustic energy power generation noise reduction plate 1 is provided with a connecting groove 7, the bottom surface is provided with a connecting block 8, the connecting grooves 7 and the connecting block 8 are both positioned at the side end part of the acoustic energy power generation noise reduction plate and are both provided with bolt holes I9, and the connecting block 8 of the previous acoustic energy power generation noise reduction plate 1 is inserted into the connecting groove 7 of the next acoustic energy power generation noise reduction plate 1 and is connected through bolts.
Furthermore, the front and the back of each layer of acoustic energy power generation noise reduction plate 1 are provided with a positioning groove 10 and a positioning plate 11, the positioning groove 10 is formed downwards from the top surface of the acoustic energy power generation noise reduction plate 1, the positioning plate 11 extends downwards from the bottom surface of the acoustic energy power generation noise reduction plate 1, and the positioning plate 11 of the previous acoustic energy power generation noise reduction plate 1 is inserted into the positioning groove 10 of the next acoustic energy power generation noise reduction plate 1 so as to be positioned when being installed.
Furthermore, a positioning pin 12 is disposed on a side surface of the positioning plate 11, and a pin slot corresponding to the positioning pin 12 is disposed on the positioning slot 10.
Further, bolt holes II 13 are formed in the positioning plate 11 and the positioning groove 10, and the positioning plate 11 and the positioning groove 10 are connected through bolts.
Further, set up the concave station on the opening of the board 1 top surface of making an uproar falls in the acoustic energy electricity generation, piezoelectric patches 2 are placed in the concave station, have placed sealing washer 14 on piezoelectric patches 2, and the board 1 of making an uproar falls in last acoustic energy electricity generation compresses tightly the sealing washer 14 of the board 1 of making an uproar falls in next acoustic energy electricity generation, reaches sealed and fixed piezoelectric patches 2's effect, and this kind of fixed mode is simple and easy reliable and makes things convenient for the dismouting of piezoelectric patches 2, and can not destroy any structure when the dismouting.
Furthermore, the noise reduction and transduction device combining the helmholtz resonance effect and the venturi effect further comprises a top cover 15 arranged above the uppermost acoustic power generation noise reduction plate 1 and a bottom plate 16 arranged below the lowermost acoustic power generation noise reduction plate 1, so that a closed structure is formed; a top cover connecting block corresponding to the connecting groove 7 and a top cover positioning plate corresponding to the positioning groove 10 are arranged on the top cover 15, the top cover connecting block is inserted into the connecting groove of the uppermost acoustic power generation noise reduction plate 1 and connected through a bolt, and the top cover positioning plate is inserted into the positioning groove of the uppermost acoustic power generation noise reduction plate 1 and connected through a bolt; the bottom plate 16 is a sound energy power generation noise reduction plate with a flat bottom surface.
Example 2
The embodiment provides a noise reduction and transduction method combining a helmholtz resonance effect and a venturi effect, and a piezoelectric plate 2 in the noise reduction and transduction device combining the helmholtz resonance effect and the venturi effect is connected with an external circuit;
according to the Helmholtz resonance effect, when incident noise is consistent with the natural frequency of the Helmholtz resonator 3, sound waves press gas in the Helmholtz resonant cavity 3.1 to generate compression expansion reciprocating deformation through the neck 3.2, so that the piezoelectric sheet 2 is caused to generate stretching compression reciprocating motion, alternating charges can be generated on the surface of the piezoelectric sheet 2 due to the piezoelectric effect, the piezoelectric sheets 2 are connected in series and in parallel, and after current signals are rectified and transformed, direct current is formed, the conversion from sound energy of the noise to electric energy is realized, and noise suppression is realized;
according to the Venturi effect, when the limited flow passes through a reduced flow cross section, the flow velocity of the fluid is increased, and the Bernoulli's law shows that the increase of the flow velocity is accompanied with the reduction of the fluid pressure, the airflow enters the throat 4.2 from the inlet section 4.1 of the Venturi channel 4, high-speed flow is generated, low pressure is generated near the high-speed flowing fluid, so that adsorption is generated, the throat 4.2 is connected with the Helmholtz resonator 3, the pressure of the Helmholtz resonator 3 is lower than the environmental pressure, so that the piezoelectric plate 2 is deformed, electric charges are generated on the surface of the piezoelectric plate 2 due to the piezoelectric effect, the piezoelectric plate 2 is connected in series and in parallel, and after current signals are rectified and converted, direct current is formed, so that the conversion of the kinetic energy of the fluid into electric energy is realized;
when both noise and air flow are present in the environment, the two effects act simultaneously, and energy is extracted from the environment while reducing noise.
Example 3
In this embodiment, the acoustic energy power generation noise reduction plate 1 is integrally designed to have a length of 600mm, a width of 600mm and a thickness of 40 mm.
The dimensions of the Venturi passage 4 are that the diameter of the inlet section 4.1 is 30mm, the diameter of the throat 4.2 is 15mm, the length of the throat 4.2 is 20mm, and the diameter of the outlet section 4.3 is 25 mm.
The helmholtz resonator 3 is designed according to the following formula:
in the formula (I), the compound is shown in the specification,fat the frequency of the helmholtz resonance,cin order to be the speed of sound,sis the cross-sectional area of the neck part,lthe height of the neck part is taken as the height of the neck part,dv is the neck cross-sectional diameter and v is the helmholtz resonator volume.
The helmholtz resonator 3 is dimensioned: the height of the neck 3.2 is 15mm, the cross-sectional diameter of the neck 3.2 is 4mm, the height of the Helmholtz resonance chamber 3.1 is 45mm, the cross-sectional diameter of the Helmholtz resonance chamber 3.1 is 31mm, and the Helmholtz resonance chamber 3.1 is provided with a concave platform with the depth of 1.2mm at the top, so that the height of the Helmholtz resonance chamber 3.1 is 43.8 mm. The calculated resonance frequency is 246.7Hz, as shown in FIG. 6, the Helmholtz resonance frequency obtained after simulation is 245Hz, and the simulation and calculation structure error is within the allowable range.
The neck 3.2 is connected with the junction of the inlet section 4.1 and the throat 4.2.
The piezoelectric piece 2 is a circular piezoelectric ceramic piece with the diameter of 35mm and the thickness of 0.2 mm.
The bottom surface of each acoustic energy power generation noise reduction plate 1 is provided with a wire groove 5 with the depth of 10mm and the width of 10mm, and the wire groove is used for wiring the piezoelectric plate 2.
The wire slot 5 is internally provided with a threading hole 6 with the diameter of 8mm for connecting the piezoelectric patches 2 between layers.
When only noise exists in the environment, the noise passes through the venturi channel 4, when the frequency of incident noise is 245Hz and is consistent with the resonance frequency of the helmholtz resonator 3, the sound wave presses air in the helmholtz resonant cavity 3.1 to generate the fastest reciprocating motion speed of compression and expansion, so that the piezoelectric plate 2 is driven to deform, alternating charges are generated due to the piezoelectric effect, the piezoelectric plate 2 is connected in series and in parallel, and after the alternating current signals are rectified and converted, direct current is formed, and the conversion from sound energy to electric energy is realized.
When only airflow exists in the environment, the airflow passes through the venturi channel 4, and during the flowing process from the inlet section 4.1 to the outlet section 4.3, a negative pressure is formed at the throat 4.2 due to the venturi effect, and since the throat 4.2 is connected with the helmholtz resonator 3.1 through the neck 3.2, the internal pressure of the helmholtz resonator 3.1 is lower than the ambient pressure, so that the piezoelectric sheet 2 is deformed, and thus charges are generated. The piezoelectric sheets 2 are connected in series and in parallel, and alternating current signals are rectified and converted to form direct current, so that conversion from kinetic energy of fluid to electric energy is realized.
When both noise and airflow exist in the environment, the two effects exist in a composite mode, and energy is obtained from the environment while the noise is reduced.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A noise reduction and transduction device combining a Helmholtz resonance effect and a Venturi effect is characterized by comprising a sound energy power generation noise reduction plate and a piezoelectric sheet, wherein a working unit consisting of a Helmholtz resonator and a Venturi channel is arranged in the sound energy power generation noise reduction plate;
the Helmholtz resonator is vertically arranged and comprises a Helmholtz resonant cavity and a neck which are communicated, and the top of the Helmholtz resonant cavity is sealed by a piezoelectric sheet arranged on an opening on the top surface of the acoustic energy power generation noise reduction plate;
the Venturi channel transversely penetrates through the front face and the back face of the acoustic energy power generation noise reduction plate and comprises an inlet section, a throat and an outlet section which are communicated, and the throat is communicated with the neck of the Helmholtz resonator.
2. The helmholtz resonance effect and venturi effect combined noise reduction and transduction device according to claim 1, wherein the helmholtz resonator is designed according to the following formula:
in the formula (I), the compound is shown in the specification,fat the frequency of the helmholtz resonance,cin order to be the speed of sound,sis the cross-sectional area of the neck part,lthe height of the neck part is taken as the height of the neck part,dis the diameter of the neck section, and v is the volume of the Helmholtz resonance cavity;
the venturi channel design follows the following principle:
the inlet section is a conical pipe, and the cone angle is 21 +/-2 degrees; the throat is a straight pipe; the outlet section is a conical pipe, and the cone angle is 8-15 degrees.
3. The Helmholtz resonance effect and Venturi effect combined noise reduction and transduction device according to claim 2, wherein a plurality of working units are sequentially arranged in the acoustic energy power generation noise reduction plate, a wire groove is formed in the bottom surface of the acoustic energy power generation noise reduction plate, and a threading hole penetrating through the top surface and the bottom surface is formed in the wire groove;
the piezoelectric pieces corresponding to each working unit are connected by a lead, and the lead passes through the wire groove and the threading hole to be connected with an external circuit.
4. The Helmholtz resonance effect and Venturi effect combined noise reduction and transduction device according to claim 3, characterized by comprising a plurality of layers of acoustic energy power generation and noise reduction plates;
the top surface of every layer of acoustic energy power generation noise reduction plate is provided with the connecting groove, and the bottom surface is provided with the connecting block, and connecting groove and connecting block all are located the side tip of acoustic energy power generation noise reduction plate and all are provided with bolt hole I, and the connecting block of the last acoustic energy power generation noise reduction plate inserts and passes through bolted connection in the connecting groove of the next acoustic energy power generation noise reduction plate.
5. The Helmholtz resonance effect and Venturi effect combined noise reduction and transduction device according to claim 4, wherein the front surface and the back surface of each layer of acoustic energy power generation noise reduction plate are provided with positioning grooves and positioning plates, the positioning grooves are formed downwards from the top surface of the acoustic energy power generation noise reduction plate, the positioning plates extend downwards from the bottom surface of the acoustic energy power generation noise reduction plate, and the positioning plate of the previous acoustic energy power generation noise reduction plate is inserted into the positioning groove of the next acoustic energy power generation noise reduction plate.
6. The Helmholtz resonance effect and Venturi effect combined noise reduction and energy conversion device according to claim 5, wherein a positioning pin is arranged on the side surface of the positioning plate, and a pin groove corresponding to the positioning pin is arranged on the positioning groove.
7. The Helmholtz resonance effect and Venturi effect combined noise reduction and energy conversion device according to claim 6, wherein the positioning plate and the positioning groove are provided with bolt holes II, and the positioning plate and the positioning groove are connected through bolts.
8. The Helmholtz resonance effect and Venturi effect combined noise reduction and transduction device according to claim 7, wherein a concave table is arranged on an opening on the top surface of the acoustic energy power generation noise reduction plate, the piezoelectric sheet is placed in the concave table, the sealing ring is placed on the piezoelectric sheet, and the previous acoustic energy power generation noise reduction plate compresses the sealing ring of the next acoustic energy power generation noise reduction plate.
9. The helmholtz resonance effect and venturi effect combined noise reduction transducer device according to claim 8, further comprising a top cover disposed above the uppermost acoustic energy power generation noise reduction plate and a bottom plate disposed below the lowermost acoustic energy power generation noise reduction plate;
the top cover is provided with a top cover connecting block corresponding to the connecting groove and a top cover positioning plate corresponding to the positioning groove, the top cover connecting block is inserted into the connecting groove of the uppermost acoustic energy power generation noise reduction plate and connected through a bolt, and the top cover positioning plate is inserted into the positioning groove of the uppermost acoustic energy power generation noise reduction plate and connected through a bolt;
the bottom plate is a sound energy power generation noise reduction plate with a smooth bottom surface.
10. A noise reduction and transduction method combining a helmholtz resonance effect and a venturi effect, which is characterized in that a piezoelectric plate in a noise reduction and transduction device combining the helmholtz resonance effect and the venturi effect according to any one of claims 1 to 9 is connected with an external circuit;
according to the Helmholtz resonance effect, when incident noise is consistent with the natural frequency of a Helmholtz resonator, sound waves press gas in a Helmholtz resonance cavity to generate compression expansion reciprocating deformation through a neck, so that a piezoelectric sheet is stretched, compressed and reciprocated, and alternating charges are generated on the surface of the piezoelectric sheet due to the piezoelectric effect, the piezoelectric sheet is connected in series and in parallel, and after current signals are rectified and converted, direct current is formed, the conversion from sound energy of the noise to electric energy is realized, and meanwhile, noise suppression is realized;
according to the Venturi effect, when the limited flow passes through a reduced flow cross section, the flow velocity of fluid is increased, and the Bernoulli's law shows that the increase of the flow velocity is accompanied with the reduction of the fluid pressure, airflow enters a throat from an inlet section of a Venturi channel, high-speed flow can be generated, low pressure can be generated near the high-speed flowing fluid, so that adsorption action is generated, a piezoelectric sheet is deformed due to the fact that the throat is connected with a Helmholtz resonator, the pressure of the Helmholtz resonator is lower than the environmental pressure, electric charges can be generated on the surface of the piezoelectric sheet due to the piezoelectric effect, the piezoelectric sheet is connected in series and/or in parallel, and after rectification conversion is performed on current signals, direct current is formed, and conversion from the kinetic energy of the fluid to electric energy is realized;
both effects work simultaneously when there is both noise and air flow in the environment.
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